Erasing attachment for typewriters



T Feb. 5, 1946. I c. R. BENNETT ERASING ATTACHMENT FOR II'YPEWRI'IERSFiled March 27, 1944 mm F CHARLES' R. BENNETT INVENTOR ATTORNEYSPatented Feb. 5, 1946 U'NITED p STATE 4 TYPEWRITERS r I Charles R.Bennett, East Qleveland, Ohio v .7

Application March 27, 1944, Serial Nor 528.291

e claims. (or; 197-181) This invention relates to erasing attachmentsfor typewriters and more particularly relates to an erasing attachmentWhich is key operated.

One of the objects of the invention is .to provide a simple andeffective erasing device which which is provided with an-erasing headanda rel- .atively movable erasing means operable upon impact of thehead with the platen and the sheet of paper carried thereon to'cause theerasing means to movably engage the surface of the paper under pressuresufiicient to remove any undesirable characters from the surface of thepaper engaged by the eraserr Another object'of the invention is toprovide a typewriter erasing attachment with means whereby the devicemay be so mounted that upondepression of the actuating key, the erasingelement will move into proper alignment or position to strike the platenuponlthe character to b erased,

Other objects and advantages of my invention will become more apparentfrom thefollowing description of an embodiment thereof reference beingmade to the accompanying drawing in which like reference characters areemployed to designate like parts throughout the same.

In the drawing:

Figure 1 is a plan view of my invention shown applied to a typewriter,the latter being shown only in outline for purposes of illustration;

Figure 2 is an enlarged plan view of a device embodying my invention andshows the erasing elements or scrapers in erasing engagement with thepaper on the platen when the eraser key is depressed; i I i l Figure 3is a front view of the eraser, head looking to the right at Figure 2;and,

Figure 4 is a view similar to that of Figure 2 but illustrates therelation of the parts when the head iswithdrawn to the broken lineposition in Figure 1. t

Referring now more particularly to the drawingin which I haveillustrated one embodiment of the invention, a typewriter is indicatedgenerally at I and is provided with the usual platen! for receivinga'sheet of paper in the usual manner on which characters are to betyped.

In carrying out my invention .Ihave provided n arm g pivoted at A to theframe of theitypewriter to swing ina substantially horizontal planetoward and away from the platen 2. The rear endof the arm is formed witha projection 5 apertured at 6 to receive the looped end of a link 1which is connecteda't its iother end 8 with a rocking lever 9 pivotallymounted on a boss in formed on the frame I .'"'A coiled springl connectsthe typewriter frame withthe mid portion ofthelinkatll. y v j A key l3on the key arm hin ed at E5 is also connected with the rockinglever 9 bymeans of a link I6 so that when the key is depressed; motion will betransmittedthrough the linkage l and I 6' and the rocking lever 9 toswing theeraser arm 3 about'its pivot '4' to thefull line position shownin-Figure 1,that-is',to impact'th'e eraser element carried, bythejeraserhead H, with the platen 2.7 I I Referring now more particularlyto'Figures 2, 3 and 4, I will describe the'construction and operation oftheeraser device carried by the arm 3. A head I! is formed on the outerend of the arm and comprisesa pair of parallel side walls I 8 and I9spaced apart andgrooved internally at 20 to provide a guide way for theplunger 2! which is adapted to slide along the guide way in eitherdirection. The plunger-is normally urged-upwardly. as in Figuredbythelcompression spring 22 whichmay be interposed between the movementthereofin both directions.

the bottom wall 23' of the guide way and the bottom surface of theplunger 2| as shown in Figure 2. The upper portion or the plunger, whichis substantially U shape, is formed with a pair of guards or stops 24,the outer end surfaces of whichengage thepaper on the platen 2 when thekey. 13 is depressed. Atransverse bar 25 is spaced below the guards 24cand is provided as a horizontal support for the eraser belt 26 overwhich the latter passes or'slides as the device is operated. I v w-Adjustably securedto one outer side of the head l'| is a rack 21 alongwhich the pinion 28 carried by the eraser wheel 29 travels, the wheel 29and the pinionrotating together as a unit. It will be seen that theeraser wheelie rotates within the U shaped plunger, the wheel shaft 30being rotatably mounted in the arms, of the plunger and extendingoutwardly thereof on both sides and through the elongated slots 3| and32 formed in the parallel sides of the head l1. These slots serve tofurther guide the movement of the plunger in the head and also act tolimit- One end of the Wheel shaft 30" carries the pinion on the outerside of the-adjacent head side wall 18 so that the teeth of the pinionmay engage the teeth of the'rack as shownin Figure 2.

The erasing element consists of a belt 25 overlying and anchored at onepoint to the periphery of the wheel 29, the belt also being threadedover the belt bar 25 as previously explained. .A' plurality of abrasive,scraping orv cutting members 3| is carried by the belt and are soarranged that the efiectiveabra sive, scrap ing or cnttinggareasiorsurfaces thereof pass beitween the guards 24" and sufficientlybeyondtlie.

outerconfines thereof to efiectively engage the paper on the platen 2for the purposes explainedwhen the key I3 is depressed as showniinjifigsures 2 and 4.

the plunger upwardly. in the head; the erasing elements 3| will bepositioned:,ta-themightsofi the:

plunger as in Figure 4 ready to be driven across and in contact with thepaper area tobe-erased- Since the spring 22 normally tends to project.

' I claim:

1. In a key operated erasing attachment for a typewriter having aplaten, an eraser element,

a swinging carrier for the eraser, said eraser element being movable inthe carrier in a direction substantially parallel to the axis of theplaten in response to an impact blow delivered by the carrier to the.platen, and key operated means to swing said carrier against the platento deliver aniimpact;blomthereagainst andgeared means responsive totheforce o'fsaid' impact to drive the eraser element into erasing contactwith and across the area to be erased.

2: A: key--pperated erasing attachment for a trpewriter comprising anarm, key operated means to impel. said arm toward the platenof'the-typewriter, a plunger slidable on said arm and normally;projecting therefrom, erasing means movably carried by said slidingmeans, a

upon a downwarmmovement orthenl n er due V p to. i'rnpactbf the guard.with. the. platen. As the 1 plungerisforced; backiinto the.head as inFig-,-

ure 2 against. the. compression of the spring; 22, the; pinion 28 will;travel. along, the: rack. and. 'suchgmovement;wilLrotatetheeraser Wheel;2-9,.in

a. countereclockwise'. direction, .thus bringing th'e erasing elements.across; and. between -.-theguides 24' and at the same time inefiectiveerasing .0011.- I tactwith: that. portion-.of the-paper Whichlies within. thetype space.32:andwhiohcontainsa character tobe erased...

While -I have shown; theerasing; elements 311 as comprising. blades for.scrapinggthepaper surface during, the; erasing; operation, it is130;136, underv stood that in place-of the .--blades;3-l; abrasive.- or

rubbing. members may; be. employed withsequally efiective results. Asthe; head is. retractedorr moved away; vfrom the platem partly by theforce of: the spring 22 and also-with the aid-of spring: lhthe plunger21 and; thezerasingl; wheel 2.9 carried. thereby willbeiprojectediupwardly-and outwardlyoffthe head as indicated. in Figure;4'; in: position: for: the; next impact. blow-against; the. platen; Of:course, as-

the head: I 1V and the; arm:;3 move away from: the platenwtoward. the;broken line: position in .l Figure ly theikey' I 3 will .returnto its:former upper. position,. suchwmotionzofi theaarm Kbeing transmittedthrough thezlinkss'l and I6: and the rocking? lever 10 to-the keybalt'lfiz. V y

Erom the foregoing description: and the.- drawing it will; be seenthat'by. my .inventon T have provided. an: eraser: attachmentziortypewriterswhich. is: ofi extremely: simple construction and positive:inzvoperation and -that': the same-is: as

easy=to operate as anyotherkey on the keyboard,

thezann 3iis swung toward the platento' engage the guards 24 with theplaten in the type space 33? under" atsufiiciently sharp impact blow tocause: thezextend'ed plunger it to be telescoped rearwardly in the"headl'l suchmovement of thescone.ofrtheefollewinggclaims; a

rack; carried by said arm and a pinion carried by, said plunger: andengaging said rack: to actuate; saiderasing. means-upon; a-movement, ofthe plunger out. of its.. normallyproiected p sition in. response. teamimpact= blow. against the type writer platenr 3. A- key operatederasing; attachment: for: a

typewriter:comprising; an arm. key. operated means to impelsaidarn'rtovvard. the plateneof the typewriter, meansslidableonsaid;armv and normally proj ecting. I therefrom; erasing;means movably carried said}. sliding means.,. and; rack and. piniondriving..- means associated with. said arm, and.- said slidable member"to;- actuate said erasing meansupon .amovement; ofr'thee'slidablemeans. out; or. its. normally projected; position in response to impactwith. the; typewriter platen, said slidable means; being: movable:transversely of: said; arm and. comprising? a; hollow; memberterminating at its forward endiinapair-zofrspaced since: by: simplydepressing the-key l3 -sharply guards, said erasing: means: beingmovable between said guardsi for. contact with a. sheet of paperon:said;1platen:

LA; key operated: erasing: attachment for a typewriter: comprising ani,arm; key operated meansntoimpelisaidf armztoward the'platen 'ofthetypewriter, means slidable on said armandnormallyrproiectingtrtherefrom, erasing means-movably carried by saidsliding means; and meansassociated: with; said arm. and said slidable:memberrtotactuate said erasing means-:uporra .movement: of the slida-blemeans out of its normally" projected; position in. response to-'impact=with the typewriter platen, said slidable means-being movabletransversely of'sai'd arm and comprisingr a' hollow: member terminatingat its fore ward end in a pair of space'd -guards', said erasing means 1being movable between said guards for 4 contact with -a sheet ofpaperon-said platen, said last named? means including "arack andpiniondrive between said slidabl'em'eans and said-arm.

5. A key operated erasing attachmentfor'a typewriter comprising an arm,key operated means to impel said arm toward the. platenof thetypewriter, meansslid'able on saidarm and normally projecting therefrom;erasing means r'novably carried by said sliding means, and meansassociated with said arm and saidslidable member to actuate-said erasingmeans upon a movementof"the-slidablemeans out ofits normallyprojectediposition in response to impact with the 'type'writer platen, said.erasing means comprising a rotatable member, a belt' on said rotatablemember and" driven thereby; and erasing:elements-carried by said belfi6:..In. a l'key operated erasing attachment for a typewriter having aplaten, an eraser element, a swinging carrier for the eraser element,said eraser element being movable in the carrier in a directionsubstantially parallel to the axis of the platen in response to animpact blow delivered by the carrier to the platen, key operated meansto swing said carrier against the platen to deliver an impact blowthereagainst, said eraser element comprising a belt, and a series ofsharp erasing members carried by said belt,

sheet on said platen.

CHARLES RI BENNETT.

